Fascinating thread.

I like the tunes that are re-used - I know about 17 songs to the tune of Sweet Betsy From Pike - but then it's always interesting when (for instance) someone puts Master McGrath to a different tune, it's almost a whole new song.

There is a song from one of my kids' video games about Big Iron On His Hip (a cowboy song) that you can do the Hobo's Lament (the one where he was nothin' but a railroad bum who died out in the cold) to...

Also, I have a memory of a different song, I firmly believe it to be Irish but it might be Pentagle, where cockleshells turn silver bells? Maybe one of the "I can't marry you I have a wife at home" soldier/maid songs with a more cruel ending, like even if I didn't I wouldn't marry you? Sound familiar?